摘要
钻具摩阻力计算一直是水平多分支井钻井工艺设计与施工过程中的一个关键问题。由于水平分支井眼曲率的变化,将会使钻具的摩阻力增加,钻具的通过能力下降,严重时会导致钻头无法加压、钻柱早期破坏等复杂情况,不仅关系到安全钻井,还会增加油气井的生产成本。建立了在水平分支井眼中的钻柱摩擦阻力微分方程,并得到了在起、下钻过程中钻柱的总摩阻。
BHA friction calculation is always one critical problem of horizontal multiple branching wells in the drilling process and design.As the changes of the borehole curvature,the drilling tool friction will be increased and drilling capacity will be decreased,even cause the bit can＇t put pressure and early damage to the drill string.Thus it is not only related to the safety of drilling,but also will increase oil production cost.The differential equation for the frictional resistance on the drill string in branch horizontal wells is established and the total drill string friction during tripping is got.
出处
《科学技术与工程》
2010年第22期5378-5380,5395,共4页
Science Technology and Engineering
基金
国家科技重大专项(2008ZX05021-006)资助
关键词
水平多分支井
钻具
井眼曲率
摩阻力
微分方程
horizontal multiple branching well drilling tool borehole curvature friction differential equation
